Boiler gas-furnace



(No ModeL) J. ZELLWEGER.

BOILER GAS FURNAGE.

No. 258,525. Patented May 23, 1882..

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JOHN ZELLXVEGER, OF CHICAGO, ILLINOIS.

BOILER GAS-FURNACE.

SPECIFICATION forming part of Letters Patent No. 258,525, dated May 23, 1882, Application filed January 12, 1882. (No model.) 7

To all whom it may concern:

Be it known that I, JOHN ZELLWEGER, a citizen oftheUnited States, residingatGhicago, in the county of Cool; and State of Illinois, have invented certain new and useful Improvements in Boiler Gas-Furnaces, and I do hereby declare the following; to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon ,which form a part of this specification.

The present invention relates to that class of boiler and other furnaces in which a gaseous fuel is used mixed with atmospheric air, the latter being heated prior to its admission into the burner or combustion-chamber by passing it through a chamber or flue which is heated by the out-going products of combustion.

The invention consists in the construction and combination of parts, which will hereinafi ter be more fully described, and then set forth in the claims.

In the accompanying drawings, Figure 1 is a vertical longitudinal section of a boiler gasfurnace embodying my improvements. Fig. 2 is a vertical transverse section taken through the lines 00 m, Fig. 1. Figs. 3 and tare similar sectional views taken respectively through the lines y y and z z of Fig. 1. Figs. 5 and 6 illustrate a modified construction of burner and air-inlet flues.

The letter A designates a horizontal flue, which serves for conducting a gaseous fuel from a suitable gas producer, holder, or reservoir into a vertical extension or chamber, a, located at the end of said horizontal flue. The roof of this chamber a is provided with a series of ports or openings, 11, which permit the entrance ot' the gaseous fuel into the mixing or combustion chamber B, where it meets and mingles with atmospheric air discharged into said chamber B through the ports (1, made in the rear thereof. The openings (1 are arranged exactly opposite the solid portion or bridges, between the openings 1) in the floor of the mixing-chamber, so as to bring the two series of openings out of line with each other for insuring a better diffusion or mixing of the gas and air. The commingled gas and air are ignited in the chamber B, and the resultant flame passes through an opening or slot, c, in the top of the combustion-chamber, and strikes a deflector, O, which consists of a vertical front plate, a horizontal topv plate, and a series of vertical partition-plates arranged over the slot or opening 6, so as to form a series of distinct passages for the escape of the flamein to the boiler-chamberP. Theproductsofcombustion pass under the boiler E to the rear of the chamber P, and thence through the lines of the boiler into a vertical flue, F, located in front of the boiler and combustion chamber. This flue F conducts the products of combustion into a horizontal bottom flue, D, which is arranged below the burner and leads into a recuperator or regenerator chamber, G, which extends in a rearward direction to the smoke-stack of the furnace. The recuperatorGis dividedinto two longitudinal top and bottom chambers, g g, by means ofametallicpartition-plate, H,which extends the entire length of said recuperator, as is clearly shown in Fig. 1. The upper chamber, 9, at its rear or stack end receives the necessary amount of atmospheric air for burning the gas in the combustion-chamber, and said air in passing forward becomes heated by contact with the iron plate or partition H, and rises into the combustion-chamber through the openings 1) to mingle or combine with the gas admittedtherein. Themetallicpartition-plate H may either be smooth or it may be corrugated, for increasing the heating or radiating surface thereof, and in certain instances Ipropose to substitute inverted troughs, instead of said partition,for forming independent conducting-fines. I also propose to heat the air by passing it through a series of pipes extend in g through the top of the recuperator.

I have herein represented the recuperator as extending under the boiler, which is the preferable location thereof but it will be obvious that it may be placed outside of the furnace between it and the stack. In all cases, however,itstartsintherearofthe burner,justbelow where the air enters the combustion-chamber.

The gas-flue A is in the various figures of the drawings shown as running parallel with the flues D for the escape of the products of combustion but I desire it to be understood that instances may occur when it will be found necessary to locate the gas-flue at right angles to the boiler. In such a case the escape-fines g are arranged or made to pass below the gasues.

The burner or combustion-chamber itself may be arranged at right angles to the boiler, as is shown in Figs. 1 and 3; but I also propose to arrange it so as to run lengthwise with the boiler, as is illustrated in Figs. 5 and 6. In the latter instance the air heating and supply chamber is branched at its front end, so as to admit air into the combustion-chamberthrough a double series of inlet-openings, c.

The outletof the combustion-chamber herein shown is made in the form of a contracted slot or fissure, so as to produce a short flame for preventing thecondensation of carbon, as soot on the boiler, and obviating the production of a smoky flame.

Thecombustion-chamberisin communication with a firing-hole, M, which extends through the front of the furnace-wall, and is of special service for starting the fire when working the furnace intermittently, and for cleaning the gas-ports.

It is well known that coal-gas and cold air do not burn readily in a cold burner, and hence a small fire from shavings and kindling-wood maintained in the firing-hole M for a short time will serve to properly warm the burner.

The firing-hole may be provided with a grate, and it has a doorfor closing it during ordinary service. This door is generally provided with a register for regulating the amount of air admitted through the firing-hole.

A curved shield, u, arranged at the front of the boiler, passes around a man-hole in the boiler-shell, as shown in Fig. 2.

In place of the partitioned deflector herein shown, I may use an arched deflector, which covers and projects over the flame-orifice of the burner. In order to reduce the loss of heat, it is of advantage to provide the door in front of the boiler-flueswith a non-conductin g cover, or to make it double with an intermediate airspace.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a gas-burnin g furnace, the combination of the vertical escape-flue F, the bottom flue connecting therewith, and the partitioned recuperator H, having upper air-heating chamber, g, and bottom chamber, g, for the outgoing products of combustion, and a burner located at the front end of the air-heating chamber, substantially as and for the purpose set forth.

2. In a gasburnin g furnace, the combination of the horizontal firing-hole M and vertical escape F, surrounding the same, with the burner B, arranged at the rear of the firing-hole, as and for the purpose set forth.

,3. In a gas-burnin g furnace, the combination of the burner B, having a contracted outlet, 0, for the flame, gas-inlet openings b, and air-supply openings (1, and the superposed deflector c, with gas-supply flue A, and hot-air flue g, as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN Z ELLWEGE It.

W'itnesses:

MICHAEL LANGAN, ADOLF SCHNYDER. 

